package com.github.binarywang.demo.wechat.controller;

import me.chanjar.weixin.cp.api.WxCpService;
import me.chanjar.weixin.cp.bean.WxCpXmlMessage;
import me.chanjar.weixin.cp.bean.WxCpXmlOutMessage;
import me.chanjar.weixin.cp.message.WxCpMessageRouter;
import me.chanjar.weixin.cp.util.crypto.WxCpCryptUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

/**
 * * @author Binary Wang(https://github.com/binarywang)
 */
@RestController
@RequestMapping("/wx/cp/portal")
public class WxPortalController {
  private final Logger logger = LoggerFactory.getLogger(this.getClass());

  @Autowired
  private WxCpService wxService;

  @Autowired
  private WxCpMessageRouter router;

  @GetMapping(produces = "text/plain;charset=utf-8")
  public String authGet(@RequestParam(name = "msg_signature", required = false) String signature,
                        @RequestParam(name = "timestamp", required = false) String timestamp,
                        @RequestParam(name = "nonce", required = false) String nonce,
                        @RequestParam(name = "echostr", required = false) String echostr) {
    this.logger.info("\n接收到来自微信服务器的认证消息：signature = [{}], timestamp = [{}], nonce = [{}], echostr = [{}]",
        signature, timestamp, nonce, echostr);

    if (StringUtils.isAnyBlank(signature, timestamp, nonce, echostr)) {
      throw new IllegalArgumentException("请求参数非法，请核实!");
    }

    if (this.wxService.checkSignature(signature, timestamp, nonce, echostr)) {
      return new WxCpCryptUtil(this.wxService.getWxCpConfigStorage()).decrypt(echostr);
    }

    return "非法请求";
  }

  @PostMapping(produces = "application/xml; charset=UTF-8")
  public String post(@RequestBody String requestBody,
                     @RequestParam("msg_signature") String signature,
                     @RequestParam("timestamp") String timestamp,
                     @RequestParam("nonce") String nonce) {
    this.logger.info("\n接收微信请求：[signature=[{}], timestamp=[{}], nonce=[{}], requestBody=[\n{}\n] ",
        signature, timestamp, nonce, requestBody);

    WxCpXmlMessage inMessage = WxCpXmlMessage.fromEncryptedXml(requestBody, this.wxService.getWxCpConfigStorage(),
        timestamp, nonce, signature);
    this.logger.debug("\n消息解密后内容为：\n{} ", inMessage.toString());
    WxCpXmlOutMessage outMessage = this.route(inMessage);
    if (outMessage == null) {
      return "";
    }

    String out = outMessage.toEncryptedXml(this.wxService.getWxCpConfigStorage());
    this.logger.debug("\n组装回复信息：{}", out);
    return out;
  }

  private WxCpXmlOutMessage route(WxCpXmlMessage message) {
    try {
      return this.router.route(message);
    } catch (Exception e) {
      this.logger.error(e.getMessage(), e);
    }

    return null;
  }

}
